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Telegraphy, Wireless and Wire
por Fitzpatrick, O. B
- Usado
- Brochura
- Condição
- Good condition - some lightly bent corners/none
- Livreiro
-
Coeur d'Alene, Idaho, United States
Formas de pagamento
Sobre este item
Telegraphy, Wireless and Wire
by O. B. KirkpatrickContinental Morse & American Morse Code InstructionsKirkpatrick, O. B.Published by Instructograph Company, Chicago, IL, 1947Paperback5 1/2 x 8 inches, 52 pages with illustratons
Telegraphy is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.
Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Many methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples.
In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging.------------------------------The Instructograph was a paper tape-based machine used for the study of Morse code.
The paper tape mechanism consisted of two reels which passed a paper tape across a reading device that actuated a set of contacts which changed state dependent on the presence or absence of hole punches in the tape. Most of them would be wound by hand or be plugged into a walloutlet. Most plugin outlet based instructographs would have a set of nobs that can control the speed and volume.
The contacts could operate an audio oscillator for the study of International Morse Code (used by radio), or a sounder for the study of American Morse Code (used by railroads), or a light bulb (Aldis Lamp - used by Navy ship to ship or by Heliograph).
The Instructograph was in production from about 1920 through 1983. The latest version of the Instructograph was the model 500 which included a built in solid state oscillator. This model was available to be purchased as new through at least 1986.
by O. B. KirkpatrickContinental Morse & American Morse Code InstructionsKirkpatrick, O. B.Published by Instructograph Company, Chicago, IL, 1947Paperback5 1/2 x 8 inches, 52 pages with illustratons
Telegraphy is the long-distance transmission of textual or symbolic (as opposed to verbal or audio) messages without the physical exchange of an object bearing the message. Thus semaphore is a method of telegraphy, whereas pigeon post is not.
Telegraphy requires that the method used for encoding the message be known to both sender and receiver. Many methods are designed according to the limits of the signalling medium used. The use of smoke signals, beacons, reflected light signals, and flag semaphore signals are early examples.
In the 19th century, the harnessing of electricity led to the invention of electrical telegraphy. The advent of radio in the early 20th century brought about radiotelegraphy and other forms of wireless telegraphy. In the Internet age, telegraphic means developed greatly in sophistication and ease of use, with natural language interfaces that hide the underlying code, allowing such technologies as electronic mail and instant messaging.------------------------------The Instructograph was a paper tape-based machine used for the study of Morse code.
The paper tape mechanism consisted of two reels which passed a paper tape across a reading device that actuated a set of contacts which changed state dependent on the presence or absence of hole punches in the tape. Most of them would be wound by hand or be plugged into a walloutlet. Most plugin outlet based instructographs would have a set of nobs that can control the speed and volume.
The contacts could operate an audio oscillator for the study of International Morse Code (used by radio), or a sounder for the study of American Morse Code (used by railroads), or a light bulb (Aldis Lamp - used by Navy ship to ship or by Heliograph).
The Instructograph was in production from about 1920 through 1983. The latest version of the Instructograph was the model 500 which included a built in solid state oscillator. This model was available to be purchased as new through at least 1986.
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Detalhes
- Livreiro
- Worldwide Collectibles
(US)
- Nº do estoque do livreiro
- 912201804
- Título
- Telegraphy, Wireless and Wire
- Autor
- Fitzpatrick, O. B
- Estado do livro
- Usado - Good condition - some lightly bent corners
- Condição de sobrecapa
- none
- Quantidade Disponível
- 1
- Encadernação
- Brochura
- Editorial
- Instructograph Company
- Local de publicação
- Chicago
- Data de publicação
- 1947
- Peso
- 0.00 libras
- Palavras-chave
- telegraphy, morse code, telegraph
- Size
- 5 1/2 x 8 inches, 52 pages with illustratons
Termos da venda
Worldwide Collectibles
Payments are expected within 10 days unless prior arrangements are made.
Sobre o Vendedor
Worldwide Collectibles
Membro de Biblio desde 2001
Coeur d'Alene, Idaho
Sobre Worldwide Collectibles
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